AT&T Merlin 820 Service And Maintenance Manual page 61

Trouble on More Than One Voice Terminal
Figure 26—Unplugging the Cord from a PFTT
B. At the control unit, unplug the modular line cord from the
Tel. Co. Lines jack and plug it into the standard modular tele-
phone. Make certain that the line cord is labeled with the number of
an outside line on which trouble appears (see Figure 27).
Figure 27—Plugging a Modular Line Cord into a PFTT
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POWER FAILURE
TRANSFER
TELEPHONE
POWER FAILURE
TRANSFER
TELEPHONE CORD
MODULAR
NETWORK
LINE
INTERFACE
CORD
MODULAR
NETWORK
LINE
INTERFACE
CORD
POWER FAILURE
TRANSFER
TELEPHONE